An Experimental Investigation of Methods of Suppressing the Unsteady Torque Exerted on the Upper Turning Mirror of an Aircraft Mounted Coelostat Turret
AIR FORCE INSTITUTE OF TECHNOLOGY WRIGHT-PATTERSON AFB OH SCHOOL OF ENGINEERING
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Various methods of reducing the unsteady torque exerted on the upper turning mirror UTM of a coelostat turret were experimentally evaluated. The effect of an aft fairing and the turret aperture on the pressure distribution across the turret was also measured. Areas of flow separation were determined from oil flow patterns. A coelostat model with a turret diameter of five inches and capable of rotating 120 degrees in azimuth was wall mounted in a transonic wind tunnel. Data was collected for Mach numbers of .7, .85, and .95. Passive methods, consisting of external fairings and active methods, consisting of blowing and suction, were employed to reduce UTM torque.
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